javascript - Check if a timeout has been cleared?

Question

I am wondering is there a way to tell if a timeout is still set

var t=setTimeout("alertMsg()",3000);

I thought t would be like undefined when you clear it. But it seems to have some id that does not get cleared.

question from:https://stackoverflow.com/questions/5226578/check-if-a-timeout-has-been-cleared

Answer 1

Not directly, but you can create a wrapper object to give that functionality. A rough implementation is like so:

function Timeout(fn, interval) {
    var id = setTimeout(fn, interval);
    this.cleared = false;
    this.clear = function () {
        this.cleared = true;
        clearTimeout(id);
    };
}

Then you can do something like:

var t = new Timeout(function () {
    alert('this is a test');
}, 5000);
console.log(t.cleared); // false
t.clear();
console.log(t.cleared); // true